CVE-2026-23073

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> wifi: rsi: Fix memory corruption due to not set vif driver data size<br /> <br /> The struct ieee80211_vif contains trailing space for vif driver data,<br /> when struct ieee80211_vif is allocated, the total memory size that is<br /> allocated is sizeof(struct ieee80211_vif) + size of vif driver data.<br /> The size of vif driver data is set by each WiFi driver as needed.<br /> <br /> The RSI911x driver does not set vif driver data size, no trailing space<br /> for vif driver data is therefore allocated past struct ieee80211_vif .<br /> The RSI911x driver does however use the vif driver data to store its<br /> vif driver data structure "struct vif_priv". An access to vif-&gt;drv_priv<br /> leads to access out of struct ieee80211_vif bounds and corruption of<br /> some memory.<br /> <br /> In case of the failure observed locally, rsi_mac80211_add_interface()<br /> would write struct vif_priv *vif_info = (struct vif_priv *)vif-&gt;drv_priv;<br /> vif_info-&gt;vap_id = vap_idx. This write corrupts struct fq_tin member<br /> struct list_head new_flows . The flow = list_first_entry(head, struct<br /> fq_flow, flowchain); in fq_tin_reset() then reports non-NULL bogus<br /> address, which when accessed causes a crash.<br /> <br /> The trigger is very simple, boot the machine with init=/bin/sh , mount<br /> devtmpfs, sysfs, procfs, and then do "ip link set wlan0 up", "sleep 1",<br /> "ip link set wlan0 down" and the crash occurs.<br /> <br /> Fix this by setting the correct size of vif driver data, which is the<br /> size of "struct vif_priv", so that memory is allocated and the driver<br /> can store its driver data in it, instead of corrupting memory around<br /> it.